{
  "bibcode": "2021GCN.29510....1G",
  "body": "Rahul Gupta,  A. Kumar, Dimple,  A. Ghosh, A. Aryan, B. Kumar, S. B.\nPandey, and K. Misra (ARIES) report:\n\nWe observed the field of Swift detected GRB 210212A (Troja et al., GCN\n29487) with 1.3m Devasthal Fast Optical Telescope (DFOT) located at\nDevasthal observatory of Aryabhatta Research Institute of\nObservational Sciences (ARIES), India. The observations were started\non 2021-02-13 at 13:54:09 UT i.e. ~ 1.4 days after the BAT trigger. We\nhave taken multiple frames having an exposure time of 180 s in the R\nfilter. We did not detect any optical afterglow candidate within the\nSwift/XRT enhanced position (Beardmore et al., GCN 29489).\n\n\nWe obtain the following 3-sigma upper limit in the stacked image.\n\n\nDate Start_UT T_start-T0 (days) Filter  Exp time (s)  Limiting Magnitude\n\n======================================================\n2021-02-13 13:54:09   ~1.4          R   180*15      > 22.4\n\n\n\nThe magnitude is not corrected for the Galactic extinction in the\ndirection of the burst. Photometric calibration is performed using the\nstandard stars from the USNO-B1.0 catalogue.\n\nThis circular may be cited.",
  "circularId": 29510,
  "createdOn": 1613413577000,
  "email": "rahulbhu.c157@gmail.com",
  "subject": "GRB 210212A: 1.3m DFOT Optical upper limit",
  "submitter": "Rahul Gupta at ARIES, India  <rahulbhu.c157@gmail.com>",
  "eventId": "GRB 210212A"
}